Elevator energy saving device with a plurality of working modes and control method thereof

Abstract

The invention discloses an elevator energy saving device with a plurality of working modes; and the elevator energy saving device comprises an energy storage device, a charging and discharging controller, a charging and discharging circuit and an energy storage device state detector, wherein the energy storage device is bridged at two ends of a direct current bus by the charging and discharging circuit; the charging and discharging controller is connected with the charging and discharging circuit by a signal transmission line; the energy storage device state detector is respectively connected with the energy storage device and the charging and discharging controller by signal transmission lines; and the charging and discharging controller is used for controlling the charging and discharging circuit, so that the elevator energy saving device is kept in one working mode or transferred between different working modes so as to transmit energy between the energy storage device and the direct current bus. According to the invention, energy of an elevator can be saved; and the elevator energy saving device is transferred between the different working modes through comprehensively judging the terminal voltage of the energy storage device, the voltage of the direct current bus and the operation state of the elevator. The invention further discloses a control method of the elevator energy saving device.

Description

technical field [0001] The invention relates to a processing device for regenerative energy, in particular to an elevator energy-saving device with multiple working modes. The invention also relates to a control method of an elevator energy-saving device. Background technique [0002] In recent years, by properly controlling the energy storage device added to the main circuit of the elevator drive, it stores regenerative energy during the regenerative operation of the elevator motor, and releases the stored energy during the electric operation of the elevator motor. It has become a research hotspot in the elevator industry to solve the problem of processing the regenerative energy generated during the operation of the elevator motor by means of electric energy, and to realize the energy-saving effect of the elevator at the same time. Such as Chinese invention patent application publication specification CN101381046A, CN1845417A, CN1946625A, Chinese invention patent specific...

AI Technical Summary

Problems solved by technology

[0005] 1. The problem of pre-charging the energy storage device: the initial voltage of the energy storage device in this type of elevator energy-saving device is often close to zero when it is first used. At this time, the conventional control method (such as the common voltage and current double closed-loop control method) often It is not applicable to this situation, so the elevator energy-saving device must use a control method different from the voltage control process to pre-charge the energy storage device. Obviously, the working mode of the elevator energy-saving device at this time (called the pre-charging mode) is different from the latter. The elevator energy-saving device adopts the common voltage and current double closed-loop control method to control the working mode of the DC bus voltage (called the voltage control mode);

[0008] In the current published literature, no solution has been proposed for the above problems

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